The ASEC analysis team is using the ASEC automatic analysis system RAPIT to categorize and respond to known malware. This post will list weekly statistics collected from October 11th, 2021 (Monday) to October 17th, 2021 (Sunday).
For the main category, info-stealer ranked top with 58.2%, followed by Downloader with 24.6%, RAT (Remote Administration Tool) malware with 7.4%, Backdoor malware with 4.7%, Ransomware with 4.1%, and Banking malware with 0.9%.
Top 1 – BeamWinHTTP
BeamWinHTTP is a downloader malware that ranked top with 23.7%. BeamWinHTTP is distributed via malware disguised as PUP installer. When it is executed, it installs PUP malware Garbage Cleaner, and can download and install additional malware at the same time.
The confirmed C&C server URL is as follows.
Top 2 – AgentTesla
AgentTesla was ranked second with 18.1%. It is an info-stealer malware that leaks user information saved in web browsers, e-mails, and FTP clients.
Recently collected samples use the following mail servers and user accounts when leaking the collected information.
- mail.globalmedical[.]nl (185.104.29[.]70)
sender : vic@globalmedical[.]nl
receiver : sarah_borte.com.cn@dr[.]com
user : vic@globalmedical[.]nl
pw : W3ox****RhJV
- smtp.copangroup[.]xyz (194.195.211[.]26)
sender : paola.micheli@copangroup[.]xyz
receiver : paola.micheli@copangroup[.]xyz
user : paola.micheli@copangroup[.]xyz
pw : gi****.1990
- mail.appalliser[.]com (185.237.206[.]6)
sender : newwork1@appalliser[.]com
receiver : newwork2@appalliser[.]com
user : newwork1@appalliser[.]com
pw : !%RvA****Sn
As most are distributed through spam mails disguised as invoices, shipment documents, and purchase orders, the file names contain such words shown above (Invoice, Shipment, P.O. – Purchase Order). Some samples have extensions disguised as document files such as pdf and xlsx or Auto CAD blueprint files such as dwg.
- SWIFT MT760_PDF (2).exe
- RFQ NO. SAM-AM912042_PDF.exe
- comprobante de pago.PDF.bat
- copia de pago_pdf___________________________.exe
- PO 05311.exe
Top 3 – Formbook
Formbook is an info-stealer malware ranked third with 14.2%.
Like other info-stealer malware, it is mainly distributed through spam mails. The distributed file names are close to each other.
- SA00007089 – SİPARİŞ FORMU.exe
- LPO NO – 19615.exe
As Formbook is injected in a normal process that is in the directory of explorer.exe and system32, the malicious behaviors are performed by the normal process. Besides user account information in the web browser, the malware can steal various information through keylogging, clipboard grabbing, and web browser form grabbing. Below is the list of confirmed C&C server URLs of Formbook.
Top 4 – Lokibot
This week, Lokibot ranked fourth place with 12.2%. It is an info-stealer malware that leaks information about programs such as web browsers, mail clients, and FTP clients.
Being a malware that is distributed through spam mails, it shares similar distributed file names with other malware that are distributed through spam mails.
- Monthly Tax Audit.exe
- NEW PURCHASE ORDER 374785895.exe
- SE-GL-211012A-SM VN BCI.exe
As shown below, most Lokibot C&C server URLs tend to end in fre.php.
Top 5 – SnakeKeylogger
Taking fifth place with 7.7%, SnakeKeylogger is an info-stealer type malware that leaks information such as user key inputs, system clipboards, and browser account information.
Like AgentTesla, this malware uses e-mail servers and user accounts when leaking collected information. The following are the accounts used by recently collected samples.
- us2.smtp.mailhostbox[.]com (208.91.198[.]143)
- mail.alliedhealthga[.]com (107.180.56[.]180)
- mail.anglifesciences[.]com (192.185.160[.]32)
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